Thermal Engineering Exam: Quiz!

50 Questions | Total Attempts: 42

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Thermal Engineering Exam: Quiz!


Questions and Answers
  • 1. 
    What state the first law of Thermodynamics?
    • A. 

      Conservation of Energy

    • B. 

      Conservation of Mass

    • C. 

      Conservation of Momentum

    • D. 

      Conservation of Charge

  • 2. 
    What states the second law of Thermodynamics?
    • A. 

      All the heat entering in a system cannot be transformed to work

    • B. 

      Entropy is always positive

    • C. 

      Conservation of Charge

    • D. 

      Force equilibrium

  • 3. 
    What describes the Navier Stokes equations?
    • A. 

      Conduction heat transfer behavior

    • B. 

      Fluid mechanics behavior

    • C. 

      Combustion inside a piston-cylinder assembly

    • D. 

      Rotary Machinery

  • 4. 
    The compression ratio of an SI engine is in the range of:
    • A. 

      4 to 6

    • B. 

      6 to 10

    • C. 

      6 to 8

    • D. 

      10 to 14

  • 5. 
    The ignition quality of diesel fuel is indicated by:
    • A. 

      Octane number

    • B. 

      Cetane number

    • C. 

      Flash point

    • D. 

      Fire point

  • 6. 
    When air is adiabatically saturated, the temperature attained is:
    • A. 

      Dew point temperature

    • B. 

      Wet bulb temperature

    • C. 

      Dry bulb temperature

    • D. 

      Triple point temperature

  • 7. 
    A streamline and an equipotential line in a flow field.
    • A. 

      Are parallel to each other

    • B. 

      Are perpendicular to each other

    • C. 

      Intersect at an acute angle

    • D. 

      Are identical

  • 8. 
    Which of the following is not a scalar quantity?
    • A. 

      Force

    • B. 

      Speed

    • C. 

      Velocity

    • D. 

      Acceleration

  • 9. 
    In ideal machines, mechanical advantage is __________ velocity ratio.
    • A. 

      A.equal to

    • B. 

       B.less than

    • C. 

      C.greater than

    • D. 

      D.None of the above

  • 10. 
    The units of kinematic viscosity are
    • A. 

      Kg/m2-sec

    • B. 

      Kg sec/m2

    • C. 

      M/kg sec

    • D. 

      M2/sec.

    • E. 

      All of the Above

  • 11. 
    Density in terms of viscosity is
    • A. 

      Kinematic viscosity/Dynamic viscosity

    • B. 

      Kinematic viscosity x dynamic viscosity

    • C. 

      Dynamic viscosity/Kinematic viscosity

    • D. 

      Any of the above

    • E. 

      All of the Above

  • 12. 
    An object having 20 kg mass weighs 19.60 kg on a spring type balance. The value of 'g' in m/sec2 for the place is
    • A. 

      1000

    • B. 

      9.8

    • C. 

      9.9

    • D. 

      10.2

    • E. 

      10.1

  • 13. 
    A pilot tube is used for the measurement of
    • A. 

      Pressure

    • B. 

      Velocity

    • C. 

      Viscosity

    • D. 

      Surface tension

    • E. 

      Flow rate

  • 14. 
    A hydrometer is used to determine
    • A. 

      Relative humidity

    • B. 

      Buoyancy force

    • C. 

      Specific gravity of liquids

    • D. 

      Viscosity of liquids

    • E. 

      Surface tension

  • 15. 
    If the particles of a fluid attain such velocities that vary from point to point in magnitude and direction as well as from instant to instant, the flow is said to be
    • A. 

      Uniform flow

    • B. 

      Steady flow

    • C. 

      Turbulent flow

    • D. 

      Laminar flow

    • E. 

      None of the above

  • 16. 
    The equation of continuity of flow is based on the principle of conservation of
    • A. 

      Momentum

    • B. 

      Mass

    • C. 

      Energy

    • D. 

      All above

    • E. 

      None of the above

  • 17. 
    Sensible heat is
    • A. 

      That heat which causes change of state

    • B. 

      That heat which produces a rise of temperature

    • C. 

      That heat which produces a rise of temperature

    • D. 

      That can only be sensed by a thermometer

    • E. 

      None of the above

  • 18. 
    Specific heat is
    • A. 

      The amount of heat required to raise the temperature of a unit quantity of substance through 1?C

    • B. 

      The amount of heat requred to change the state or condition under which a substance exists without changing its temperature

    • C. 

      The ratio of quantity of heat required to raise the temperature of a given weight of any substance through 1?C to the quantity of heat required to raise the temperature of same weight of water through 1?C

    • D. 

      The heat sensed by a mercury thermometer

    • E. 

      None of the above

  • 19. 
    Latent heat is
    • A. 

      Heat cannot be detected

    • B. 

      Heat that does not follow first law of thermodynamics

    • C. 

      Heat required to change the substance from solid to gaseous state

    • D. 

      Heat required to change the state of substance from liquid state to solid state

    • E. 

      Heat required to change the state or condition under which the substance exists

  • 20. 
    The equilibrium conditions between supersaurated vapour and a cooled liquid surface are expressed in
    • A. 

      Calender's equation

    • B. 

      Dalton's equation

    • C. 

      Kelvin Helmhotz equation

    • D. 

      Napier's equation

    • E. 

      Clapcyron's equation

  • 21. 
    An optical pyrometer works on the principle of
    • A. 

      Expansion of fluids

    • B. 

      Change of electrical resistance

    • C. 

      Thermo-electric effect

    • D. 

      Total radiation

    • E. 

      Mono-chromatic radiation

  • 22. 
    Intercooling in multistage compressors is done
    • A. 

      To cool the air at delivery

    • B. 

      To enable use of small cylinders and eliminate problems of unbalanced forces

    • C. 

      To minimise the work of compression

    • D. 

      To supply-air at two different pressures for use

    • E. 

      To cool air during compression

  • 23. 
    During adiabatic compression
    • A. 

      No heat leaves or enters the system

    • B. 

      Maximum work is done

    • C. 

      Specific heat remains constant

    • D. 

      Temperature remains constant

    • E. 

      None of the above

  • 24. 
    Stoichiometric ratio is
    • A. 

      Chemically correct air-fuel ratio by volume

    • B. 

      Chemically correct air-fuel ratio by weight

    • C. 

      Theoretical mixture of air for complete combustion

    • D. 

      Actual ratio of air to fuel for maximum efficiency

    • E. 

      None of the above

  • 25. 
    A rich mixture will have an air-fuel ratio
    • A. 

      Less than chemically correct

    • B. 

      More than chemically correct

    • C. 

      Chemically correct

    • D. 

      Any of the above

    • E. 

      None of the above

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